# Tension on a wire

Two wires are tied to the 200 g sphere shown in figure. The sphere revolves in a horiIzontal circle at a constant speed of 7.80 m/s. The diagram shows a ball with two wires, each 1 m in length with a radius of .5 m

What is the tension in the upper wire?

What is the tension in the lower wire?

So, what i thought i would do was

T + mg = mv^2/r for the tension of the upper wire and

where T = 22.4

T - mg = mv^2/r for the tension of the lower wire..but after doing it i am not getting the right answers

and T = 26.3 but apparently neither are the right answers...

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## Answers and Replies

LowlyPion
Homework Helper
Two wires are tied to the 200 sphere shown in figure. The sphere revolves in a horiIzontal circle at a constant speed of 7.80 . The diagram shows a ball with two wires, each 1 m in length with a radius of .5 m

What is the tension in the upper wire?

What is the tension in the lower wire?

So, what i thought i would do was

T + mg = mv^2/r for the tension of the upper wire and

where T = 22.4

T - mg = mv^2/r for the tension of the lower wire..but after doing it i am not getting the right answers

and T = 26.3 but apparently neither are the right answers...

Have you properly accounted for the 30 degree angle the wires make with the vertical?